The satellite will be on a sun synchronous polar orbit at 700 km altitude with an ascending node at 6 h or 18 h.
The experiment of the Equivalence Principle test, which is the mission's main objective, only requires theoretically one week of continuous measurements. But the preparation of this experiment needs very long calibration periods (several months). Moreover this experiment will be conducted several times to exclude the parasit effects.
During the measurements phases, the satellite will be oriented in two main modes:
an inertial mode (fixed related to the Sun and the stars),
a spinning mode : in slow rotation around the orbit axis to increase the gravitational signal frequency (3 or 4 times).
During calibration phases, the satellite will be moved with programmed angular and linear trajectories enabling to accurately identify the parameters of the accelerometers.
The chosen orbit enables to insure to the satellite continuous 9-month periodes without passage in the Earth's shadow, which enables to realize the whole measurements and calibration phases during a 1 year mission.